What Is 1/2 Cup Plus 1/3 Cup? The Complete Guide to Adding Cooking Measurements
You're in the middle of a recipe, and it calls for "1/2 cup plus 1/3 cup" of something. Maybe it's flour for bread, sugar for a cake, or rice for dinner. Plus, you grab your measuring cups, and then you stop. How do you even measure that?
Here's the thing — you're not alone. Adding fractions in cooking is one of those skills nobody teaches you explicitly, but you figure out pretty quickly that you need it. The short answer is that 1/2 cup plus 1/3 cup equals 5/6 cup. But there's more to it than just the math, because actually measuring 5/6 of a cup in your kitchen is a whole different challenge.
Let me walk you through why this matters, how to do it, and some practical tricks that will make you faster in the kitchen And that's really what it comes down to..
What Is 1/2 Cup Plus 1/3 Cup?
The math is straightforward once you see it. You're adding two fractions:
- 1/2 = 3/6
- 1/3 = 2/6
Add them together: 3/6 + 2/6 = 5/6
So the total is 5/6 cup.
That's the simple answer. But here's what most people miss — understanding the why behind the math makes it easier to apply in real cooking situations. When you know that you're essentially combining a little more than half a cup with a third of a cup, you can visualize it better. And visualization matters when you're standing at the counter with flour on your hands.
Converting to Decimals
Some people think in decimals rather than fractions. If that sounds like you, here's the quick version:
- 1/2 cup = 0.5 cups
- 1/3 cup ≈ 0.333 cups
- 5/6 cup ≈ 0.833 cups
That's about 83% of a full cup. Keep that number in mind — it'll come in handy when we talk about measuring techniques.
Why These Frequencies Show Up in Recipes
Recipes often call for 1/2 cup plus 1/3 cup because it adds up to a useful amount that isn't easily measured with standard cup increments. Your typical measuring cup set includes 1/4, 1/3, 1/2, and 1 cup measurements. But 5/6? That's not a standard size.
Most guides skip this. Don't.
This is by design, somewhat. That said, many recipes were developed using weight measurements (especially baking) and then converted to volume measurements for home cooks. The result is combinations that make mathematical sense but practical sense? That's where it gets tricky.
Why It Matters in Cooking
Here's the deal — getting this wrong won't ruin every recipe. If you're making a soup and you add a little too much broth, it's fine. But in baking? That's why you can adjust. Precision matters more than most people realize.
Baking vs. Cooking
In baking, ratios are everything. Worth adding: too much flour and your cookies spread thin and crispy. Too much sugar and they burn before the center cooks through. When a recipe calls for 1/2 cup plus 1/3 cup of flour, that specific amount was tested. The author knows that 5/6 cup of flour, combined with the other ingredients at their specified amounts, produces a particular result.
Cooking (savory dishes) is more forgiving. You can usually taste and adjust as you go. But baking is chemistry, and chemistry doesn't forgive guesswork.
Portion Control and Meal Prep
If you're meal prepping or watching portions, knowing how to add these measurements accurately matters. So maybe you're dividing a recipe in half or scaling it up. Understanding how fractions work helps you make those adjustments without ending up with too much or too little.
How to Measure 5/6 Cup in Practice
Now for the part that actually matters in your kitchen. Here's the thing — you need to measure 5/6 of a cup, and you don't have a 5/6 cup measuring cup. What do you do?
Method 1: The Two-Cup Approach
Fill your 1/2 cup measure, then add 1/3 cup. This is the most direct way — you're literally doing exactly what the recipe says. It's not wrong, it's just two steps instead of one.
Method 2: The Visual Shortcut
Fill a 1 cup measure 5/6 of the way full. How do you know where 5/6 is? On the flip side, here's a trick: imagine the cup divided into six equal sections. Fill five of them. In practice, this means filling the cup just slightly less than the top — leave about a finger's width of space at the rim.
Method 3: The Conversion to Tablespoons
If you have tablespoon measures handy, this is incredibly precise. One cup = 16 tablespoons. So:
- 5/6 cup = (5/6) × 16 = 13.33 tablespoons
That's 13 tablespoons plus 1 teaspoon. Most people can measure that accurately with a standard tablespoon set Worth keeping that in mind. No workaround needed..
Method 4: Use a Scale (Best for Baking)
Here's what serious bakers do — they weigh ingredients. Consider this: if you have a kitchen scale, look up the weight of your ingredient (flour, sugar, etc. In practice, ) and measure by weight instead of volume. This bypasses the whole fraction problem entirely Nothing fancy..
Take this: one cup of all-purpose flour weighs about 120 grams. So 5/6 cup would be roughly 100 grams. Different ingredients have different weights per cup, so you'd need to look up each one, but the accuracy is worth it for baking That's the part that actually makes a difference. Turns out it matters..
Common Mistakes People Make
Guessing and Eyeballing
The biggest mistake is just eyeballing it and hoping for the best. "It looks about right" is the enemy of consistent cooking. If you're making something that matters — a birthday cake, a bread recipe, anything you're serving to people — take the time to measure accurately.
Using the Wrong Measuring Cup
Liquid measuring cups and dry measuring cups are different. On top of that, for dry ingredients like flour, sugar, and rice, use dry measuring cups (the ones you fill and level off). So for liquids, use a clear liquid measuring cup with a spout. Using the wrong type affects accuracy.
Not Leveling Off
Speaking of leveling off — this matters more than most people think. But a heaping cup of flour can have 25% more flour than a level cup. Still, that's huge. Always level off your dry measurements with a knife or spatula.
Confusing 1/3 and 1/2
In a rush, it's easy to grab the wrong measuring cup. Plus, double-check before you add. This sounds obvious, but in a busy kitchen with distractions, it happens all the time Which is the point..
Practical Tips for Fractional Measurements
Buy a Good Set of Measuring Cups
A quality set will include 1/4, 1/3, 1/2, and 1 cup measures. Some sets also include 2/3 and 3/4 cups. If you bake often, a comprehensive set is worth the small investment.
Mark Your Own 5/6 Cup
If you use a particular ingredient frequently, fill a container to 5/6 cup and mark the level with a piece of tape or a dry-erase marker. You'll never have to calculate again.
Learn the Most Common Combinations
Recipes call for certain combinations frequently. Here's a quick reference:
- 1/2 + 1/4 = 3/4 cup
- 1/3 + 1/4 = 7/12 cup (about 1/2 cup plus 1 tablespoon)
- 1/2 + 1/3 = 5/6 cup
- 1/4 + 1/4 = 1/2 cup
Knowing these automatically saves time and mental effort That's the whole idea..
When in Doubt, Scale It Out
I mentioned this before, but it's worth repeating: if you're serious about baking accuracy, a kitchen scale changes everything. And you weigh ingredients in grams or ounces, and the fractions disappear. It's cleaner, more accurate, and once you get used to it, faster Simple as that..
FAQ
What is 1/2 cup plus 1/3 cup as a decimal?
1/2 cup plus 1/3 cup equals approximately 0.833 cups, or about 83% of a full cup That's the part that actually makes a difference..
How many tablespoons is 5/6 cup?
5/6 cup equals 13 tablespoons plus 1 teaspoon.
Can I just use 3/4 cup instead of 5/6 cup?
It's close, but not exact. In real terms, 833 cups — that's roughly a 10% difference. 75 cups, while 5/6 cup is about 0.3/4 cup is 0.In most recipes, you'll notice the result.
What's the easiest way to measure 5/6 cup?
The simplest method is to fill your 1/2 cup measure, then add 1/3 cup to it. Or fill a 1 cup measure about 5/6 full — just under the rim The details matter here..
Why do recipes use these awkward measurements?
Many recipes originated with weight measurements and were converted to volume for home cooks. The math works out to amounts that aren't always convenient for standard measuring cup sets Not complicated — just consistent..
The Bottom Line
When your recipe says 1/2 cup plus 1/3 cup, you're dealing with 5/6 cup. That's why it's not a standard measurement, which is why it feels awkward. But now you know exactly what to do — measure a 1/2 cup, then add a 1/3 cup, or use one of the other tricks to get that 5/6 cup amount But it adds up..
The key is taking the extra step. Don't guess, don't eyeball, don't just pour "about enough." Measure it right, and your food will turn out the way the recipe intends. That's the difference between cooking that works and cooking that wows.
